<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Puzzler preview</title>
    <style type="text/css">
        html, body {
            width: 100%;
            height: 100%;
        }
        * {margin: 0; padding: 0}
    </style>
</head>
<body>
</body>
</html>